Singular optics; optical vortices; singular points of a wavefront; Shack-Hartmann sensor; interference pattern
36
Scopus Publications
Scopus Publications
Statistical characteristics of optical vortices in a beam with an initial phase set by Zernike polynomials and by a turbulent screen Yu. Grekova, F. Kanev, N. Makenova, I. Veretekhin 2024 International Conference Laser Optics Iclo 2024 Proceedings, 2024 With the use of numerical experiment methods we compare distributions of optical vortices in beams whose initial phase was formed by Zernike polynomials and beams with the phase set by a screen simulating atmospheric turbulence. As was shown the statistical characteristics of the singular points in both cases (polynomials and screen) satisfied the requirements of the Central limit theorem. At the same time, differences were observed in the dependence of the number of vortices on the length of the propagation path.
Characteristic features of an optical vortex distribution in a beam passed a thin layer of turbulent medium and the Central limit theorem Igor Veretekhin, Feodor Kanev, Nailia A. Makenova Proceedings of SPIE the International Society for Optical Engineering, 2023 Statistical characteristics of optical vortices have been analyzed in the paper. As was shown such vortices appear in the radiation wavefront if the initial phase is set as a mathematical raw formed by Zernike polynomials or by a phase screen simulating atmospheric turbulence with a spectrum of the index of refraction fluctuations prescribed by a von Karman formula. In both examples considered here the statistical properties of the vortex distribution satisfy the requirements of the Central limit theorem, and acceptable correspondence is also observed between parameters of beams formed by polynomials and by a phase screen.
Estimation of the Possibility of Information Transfer Using Optical Vortices in the Presence of a Background Formed by an Array of Randomly Located Dislocations F. Yu. Kanev, V. P. Aksenov, N. A. Makenova, I. D. Veretekhin Atmospheric and Oceanic Optics, 2022 A method allowing one to extract an information signal in a beam whose distortions result in the appearance of additional optical vortices in it is developed. The information is also transmitted with the use of a vortex. The investigation is carried out based on numerical experiments. All dislocations in the corresponding model are introduced into the wavefront in the plane of the source aperture and then the radiation propagates under conditions of free diffraction. The optical scheme of the experiment approximately corresponded to an optical communication line in which radiation undergoes considerable distortions in a thin medium layer located near the exit aperture of the laser generator. In this paper, two methods of extracting an information signal on the background of noises are considered and the possibility of using one of them in real communication lines is demonstrated.
Development of Singular Points in a Beam Passed Phase Screen Simulating Atmospheric Turbulence and Precision of Such a Screen Approximation by Zernike Polynomials Feodor Kanev, Nailya Makenova, Igor Veretekhin Photonics, 2022 This article addresses two issues. Firstly, it was shown that if the initial phase of a Gaussian beam is specified by the sum of Zernike polynomials or by a screen simulating atmospheric turbulence, in the process of propagation, singular points appear in the wavefront of such a beam. With the use of numerical simulation, the dependence of the vortices number on the distortion characteristics and on the distance traveled by the beam was determined. The second problem analyzed in the article is the problem of a phase screen approximation by a series formed by Zernike polynomials. The carried out numerical experiments made it possible to determine the dependence of approximation accuracy on the screen parameters and on the number of polynomials entering the basis of approximation.
Optical vortices in the turbulent atmosphere Feodor Kanev, Nailia A. Makenova, Igor Veretekhin Proceedings of SPIE the International Society for Optical Engineering, 2022 In the present article the influence is considered of phase screen characteristics on the statistical properties of dislocations developed in a beam passed this screen. Analysis was performed with application of numerical experiment methods, and in the developed model the screen represented a thin layer of turbulent atmosphere. Special attention was devoted to assessment of the turbulence inner scale impact on distribution of vortices. We have also shown that this distribution meets the requirements of the central limit theorem.
Development of optical vortices in a beam propagating in a turbulent atmosphere F. Kanev, A. Rukosuev, N. Makenova, I. Veretekhin 2022 International Conference Laser Optics Iclo 2022 Proceedingss, 2022 Development of singular points in a coherent beam is considered in the paper. The initial phase of radiation was set by Zernike polynomials and by a random phase screen simulating atmospheric turbulence. Several methods of detection were used to register optical vortices.
Registration of the given vortex in an array of randomly placed singular points Feodor Kanev, Nailya A. Makenova, Igor Veretekhin Proceedings of SPIE the International Society for Optical Engineering, 2021 The objective of current investigation is development of the method intended to extract useful information from a beam in the wavefront of which optical vortices are present. Developed numerical model corresponds approximately to an optical communication system operating in a turbulent atmosphere under conditions of strong distortions of radiation. Specific feature of this system is that information is also transferred by an optical vortex.
Comparison of Accuracy in the Determination of Optical Vortex Coordinates by Different Methods F. Yu. Kanev, V. P. Aksenov, N. A. Makenova, I. D. Veretekhin Optoelectronics Instrumentation and Data Processing, 2020 Two algorithms for the determination of optical vortex coordinates are considered. In the first one, the vortex is found by branching of interference pattern fringes; in the second one, as a result of processing of the wavefront gradient distribution. It is shown that both algorithms allow one to record the coordinates with a high accuracy; in addition, it is possible to determine shifts of singular points appearing as a result of radiation diffraction.
The History of the Development and Genesis of Works on Adaptive Optics at the Institute of Atmospheric Optics V. P. Lukin, L. V. Antoshkin, L. A. Bolbasova, N. N. Botygina, O. N. Emaleev, F. Yu. Kanev, P. A. Konyaev, E. A. Kopylov, V. V. Lavrinov, L. N. Lavrinova, N. A. Makenova, V. V. Nosov, E. V. Nosov, A. V. Torgaev Atmospheric and Oceanic Optics, 2020 A survey of the development of adaptive optics, its methods, and tools for the elimination of irregular distortions appearing in the process of light propagation in an inhomogeneous medium is presented. Many ideas developed in recent years were put forward rather long ago; however, only now, owing to creation of state-of-the-art hardware components of optoelectronic systems and devices, they begin to be included in the widest fields of science and technology. The work also presents the current status of adaptive optics systems in solar astronomy, as well as some aspects of their use in systems correcting distortions of powerful laser systems. A retrospective analysis of investigations in the V.E. Zuev Institute of Atmospheric Optics in relation to adaptive optics is carried out.
Methods of optical vortex registration Feodor Kanev, Valerii Aksenov Aksenov, Nailia A. Makenova, Igor Veretekhin Veretekhin Proceedings of SPIE the International Society for Optical Engineering, 2019 Properties of vortex radiation are discussed in the article using the data obtained by the authors and information found in references. Possible applications of such radiation are considered. Special attention is devoted to the methods of vortex registration. Precision of two registration algorithms is compared and particularities of their practical realization are analyzed.
Detection of an optical vortex topological charge and coordinates Nailia A. Makenova, Feodor Kanev, Valerii Aksenov, Igor Veretekhin, Feodor Starikov, Yurii Dolgopolov, Aleksander Kopalkin Proceedings of SPIE the International Society for Optical Engineering, 2018
Thermal distortions of multichannel laser radiation Nailia A. Makenova, Feodor Kanev, Vladimir Lukin, Oleg Antipov, I. D. Veretekhin Proceedings of SPIE the International Society for Optical Engineering, 2017
A series of virtual laboratory exercises for the course of theoretical fundamentals of electroengineering 8th Korea Russia International Symposium on Science and Technology Proceedings Korus 2004, 2005
Numerical simulation in adaptive optics Feodor Y. Kanev, Vladimir V. Lukin, Nailya A. Makenova Proceedings of SPIE the International Society for Optical Engineering, 2005
Algorithm for phasing a segmented mirror Feodor Y. Kanev, Vladimir P. Lukin, Nailya A. Makenova Proceedings of SPIE the International Society for Optical Engineering, 2004
Co-phasing of a telescope segmented mirror Feodor Y. Kanev, Vladimir P. Lukin, Nailya Makenova Proceedings of SPIE the International Society for Optical Engineering, 2004
